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import unittest
import typing

from statefun.core import deduce_protobuf_types


class TypeDeductionTestCase(unittest.TestCase):

    def test_simple_annotation(self):
        def foo(context, message: int):
            pass

        types = deduce_protobuf_types(foo)

        self.assertEqual(types, [int])

    def test_simple_union(self):
        def foo(context, message: typing.Union[int]):
            pass

        types = deduce_protobuf_types(foo)

        self.assertEqual(types, [int])

    def test_union_annotations(self):
        def foo(context, message: typing.Union[int, str]):
            pass

        types = deduce_protobuf_types(foo)

        self.assertEqual(types, [int, str])

    def test_no_annotations(self):
        def foo(context, message):
            pass

        types = deduce_protobuf_types(foo)

        print(types)
        self.assertTrue(types is None)
